4 REPORT T :
Transcription
4 REPORT T :
Report for Experiment 4 REPORT THERMOCHEMISTRY: ENTHALPY OF SOLUTION Student Nam e: Date: Lab Day: MonAM-086 MonPM-087 Tue AM-093 Tue PM-096 W edAM-088 W edPM-097/098 ThursAM-085 ThursPM-089 FriAM-092 W edAM-094 W edPM-095 ThursAM-090 ThursPM-091 FriAM -099 (Circle the lab day you are registered in) Lab Partner: __________________________ DATA: Calibration of Thermometers Atmospheric pressure: _____________________ Thermometer 1 W ater Ice Bath Temp ( BC) W ater Boiling Temp ( BC) Thermometer 2 W ater Ice Bath Temp ( BC) W ater Boiling Temp ( BC) Heat Capacity of the Calorimeter A1: A2: Mass of Calorimeter /g Mass of Calorimeter + Cold W ater /g Mass of Cold W ater /g (A2 – A1) Temperature of Cold W ater °C (Therm 1) Temperature of Hot W ater °C (Therm 2) Final Temperature of W ater °C (Therm 1) Mass of Calorimeter + Cold W ater + Hot W ater /g Mass of Hot W ater /g (A3-A2) -1- measured corrected measured corrected measured corrected A3: 4 Report for Experiment 4 Heat of Neutralization Concentration of HCl ________ Concentration of NaOH ________ Trial 1 Trial 2 A. Mass of calorimeter /g B. Mass HCl and calorimeter / g C. Mass calorimeter, HCl and NaOH / g D1. Mass HCl / g (B - A) D2. Mass NaOH /g (C - B) Mass of Solution (D1 + D2) Initial temp. HCl measured / oC (therm 1) Initial temp. HCl corrected / oC Initial temp. NaOH measured / o C (therm 2) Initial temp. NaOH corrected / oC E. Average Initial Temp corrected /BC Final temp. measured / oC (therm 1) F. Final temp. corrected / oC G. Temp. change corrected / oC (F - E) Precision of Volumetric Glassware Mass of Vial GROUP DATA 50 mL Beaker 50 mL Graduated Cylinder Pipette (g) Mass of Calculated Vial and Mass of Water Water (g) (g) 2 ND Group Data 50 mL Beaker 50 mL Graduated Cylinder Pipette 3 rd Group Data 50 mL Beaker 50 mL Graduated Cylinder Pipette 4 th Group Data 50 mL Beaker 50 mL Graduated Cylinder Pipette -2- Trial 3 Trial 4 Report for Experiment 4 TREATMENT OF DATA 1. A student gets the following results when calibrating his thermometer. The atmospheric pressure is 703.0 mmHg. Thermometer 1 W ater Ice Bath Temp ( BC) -0.5 W ater Boiling Temp ( BC) 97.3 The student uses this thermom eter to take the temperature of a solution and finds the temperature to be 46.3B C. W hat is the corrected temperature? (Show w ork) -3- Report for Experiment 4 2. A student gets the follow ing data for the Heat Capacity of her calorimeter . 43.5 A2: 94.2 A1: M ass of Calorimeter /g M ass of Calorimeter + Cold W ater /g M ass of Cold W ater /g (A2 – A1) Temperature of Cold W ater °C (Therm 1) 21.3 measured 45.2 measured 30.0 A3: 144.7 measured Temperature of Hot W ater °C (Therm 2) Final Temperature of W ater °C (Therm 1) M ass of Calorimeter + Cold W ater + Hot W ater corrected corrected corrected /g M ass of Hot W ater /g (A3-A2) The mcalib is 0.969 and bcalib is 2.0B C for both Thermometer 1 and Thermometer 2. Determine the heat capacity of the calorimeter. -4- Report for Experiment 4 3. A student gets the follow ing data for the heat of neutralization trials using 1.0 M NaOH and 1.0 M HCl. Trial 1 43.5 A. M ass of calorimeter /g B. M ass HCl and calorimeter / g 64.0 C. M ass calorimeter, HCl and NaOH / g 85.0 D1. M ass HCl / g (B - A) D2. M ass NaOH /g (C - B) M ass of Solution (D1 + D2) Initial temp. HCl measured / oC (therm 1) 22.1 o Initial temp. HCl corrected / C Initial temp. NaOH measured / oC (therm 2) 21.6 Initial temp. NaOH corrected / oC E. Average Initial Temp corrected /BC Final temp. measured / oC (therm 1) 28.8 o F. Final temp. corrected / C G. Temp. change corrected / oC (F - E) Using this data, determine the Molar Enthalpy of Neutralization for this trial. The mcalib is 0.969 and bcalib is 2.0BC for both Thermometer 1 and Thermometer 2 and the calculated heat capacity of the calorimeter was 33 J °C-1 . -5- Report for Experiment 4 4. a) Give a Reported Value as is described in your lab manual, for the volume of water delivered by the beaker, the graduated cylinder and the pipet. (use your data and the 3 other groups data). (See pages 15-17 of lab manual to see how to give a Reported Value for each. This includes the standard deviation and number of trials.) b) Assuming that 10.00 mL of water weighs 9.9997 g (literature value) calculate the percent error for each of the 3 types of glassware we used to deliver 10 mL of water to a vial. (Show one sample calculation.) c) Which of the 3 types of glassware seemed to deliver a volume closest to 10 mL? (If you need more room, use other side of page.) 5. Using the data your group obtained in this lab, report the following. (Note remember to corrrect your temperatures when doing your calculations and factor in the heat capacity of your calorimeter.) Summary of the molar enthalpy of solution results for each salt (Remember units) Thermometer 1: mcalib ___________ bcalib __________ Thermometer 2: mcalib ___________ bcalib __________ Heat Capacity of Calorim eter: ____________ Heat of Solutions: Molar Heat of Neutralization (ªH) Trial 1 ______ Trial 2 ______ Average Molar Heat of Neutralization (ªH) _________ -6- Trial 3 ______ Trial 4 _____